CN103414322B - Control circuit, switch converter and control method thereof - Google Patents
Control circuit, switch converter and control method thereof Download PDFInfo
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- CN103414322B CN103414322B CN201310379257.8A CN201310379257A CN103414322B CN 103414322 B CN103414322 B CN 103414322B CN 201310379257 A CN201310379257 A CN 201310379257A CN 103414322 B CN103414322 B CN 103414322B
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- 230000007257 malfunction Effects 0.000 claims description 21
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- 238000001514 detection method Methods 0.000 claims description 11
- 230000000052 comparative effect Effects 0.000 claims description 4
- 230000010354 integration Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 8
- 101150088150 VTH2 gene Proteins 0.000 description 6
- 238000007599 discharging Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
Abstract
The invention discloses a control circuit, a switch converter and a control method thereof. The switching converter comprises at least one switching tube. The control circuit controls the on and off of the at least one switching tube, the control circuit provides auxiliary power supply voltage on the auxiliary power supply capacitor, when the switching converter is in a fault state, the control circuit closes the switching converter until the switching converter is restarted after restart delay time, and the restart delay time is equal to the time length of the auxiliary power supply voltage reduced to a first threshold value, so that the timing cost and the area of the control circuit are reduced, and the integration is easy.
Description
Technical field
The present invention relates generally to a kind of electronic circuit, particularly relates to a kind of control circuit for switch converters and control method thereof.
Background technology
Nowadays, many electronic equipments all need direct current supply voltage, usually provide controlled supply power voltage by switch converters.Simultaneously in order to make switch converters not damaged under various malfunction, the control circuit of switch converters needs for it provides various protection, such as overheat protector, overcurrent protection, overvoltage protection, overload protection, open-circuit-protection and input undervoltage protection etc.Along with the development of integrated circuit, control circuit or switch converters and control circuit usually on a single die integrated.Control circuit is once monitor switch converters and break down, then closing switch converter immediately, reattempts through sufficiently long time of delay and restart switch converters.Generally, control circuit comprises counter or timer, is produced restart time of delay by counter or timer.But, when need restart time of delay longer time, such as 10ms, needs more counter or timer, and on the one hand cost is higher, is unfavorable for being integrated in control chip on the other hand, needs larger chip area.
Summary of the invention
For one or more problem of the prior art, an object of the present invention is to provide a kind of control circuit, switch converters and control method thereof.
A kind of according to an embodiment of the invention embodiment, a kind of control circuit, for at least one switching tube in control switch converter, described control circuit comprises: voltage stabilizing circuit, there is Enable Pin and output, wherein Enable Pin receives enable signal, and output provides auxiliary power supply voltage on auxiliary power supply electric capacity; On-off controller, there is first input end, the second input, Enable Pin and output, wherein first input end is coupled to the output of switch converters to receive output voltage, second input is coupled to reference signal, Enable Pin receives enable signal, and output produces pulse signal according to output voltage and reference signal; And first logical circuit, there is first input end, the second input and output, the output that wherein first input end couples guard signal, the second input is coupled to on-off controller, output produces switch controlling signal to control conducting and the shutoff of at least one switching tube described according to guard signal and pulse signal, wherein, when detecting that switch converters is in malfunction, guard signal is effective; Wherein when guard signal is effective; enable signal becomes the first state, and voltage stabilizing circuit and on-off controller turn off completely, and auxiliary power supply capacitor discharge is until when auxiliary power supply voltage is less than first threshold; enable signal becomes the second state, voltage stabilizing circuit and on-off controller enable.
In one embodiment, described on-off controller comprises: peak current control circuitry, and electric current and peak current reference signal according to flowing through at least one switching tube described provide peak value comparison method signal; Output voltage controlling circuit, produces output voltage control signal according to output voltage and reference signal; And second logical circuit, provide pulse signal according to peak value comparison method signal and output voltage control signal.
In one embodiment, described control circuit also comprises Undervoltage lockout circuit, and described Undervoltage lockout circuit turns off according to the comparative result of auxiliary power supply voltage and the first auxiliary power supply reference signal and the second auxiliary power supply reference signal or opens voltage stabilizing circuit.
In one embodiment, described control circuit also comprises Undervoltage lockout circuit, described Undervoltage lockout circuit exports Undervoltage lockout signal according to the comparative result of auxiliary power supply voltage and the first auxiliary power supply reference signal and Second Threshold, wherein said first logical circuit also comprises the 3rd input, and wherein the 3rd input receives Undervoltage lockout signal.
In one embodiment, wherein when enable signal is the first state, fault monitoring and protection circuit and Undervoltage lockout circuit turn off completely.
In one embodiment, described control circuit comprises restarts delay circuit, produces enable signal, wherein when switch converters breaks down, enable signal becomes the first state, and auxiliary power supply capacitor discharge is until when auxiliary power supply voltage is less than first threshold, and enable signal becomes the second state.
In one embodiment, restart delay circuit described in comprise: undervoltage detection circuit, has first input end, the second input and output, and wherein first input end receives auxiliary power supply voltage, and the second input receives first threshold; And trigger, have set end, reset terminal and output, wherein set termination receives guard signal, and reset terminal is coupled to the output of undervoltage detection circuit, output output enable signal.
In one embodiment, restart delay circuit described in comprise: current source, has first end and the second end, and wherein first end receives auxiliary power supply voltage; And second switch pipe, have first end, the second end and control end, wherein first end is coupled to the second end of current source, and the second end is coupled to ground, and control end receives enable signal; Wherein when enable signal is in the first state, the conducting of second switch pipe, auxiliary power supply electric capacity is discharged by current source.
A switch converters according to an embodiment of the invention, comprising: at least one switching tube, with shutoff, input voltage is converted to output voltage by the conducting of this at least one switching tube; Auxiliary power supply electric capacity, one end ground connection; Control circuit, one end is coupled at least one switching tube described, the other end is coupled to the other end of described auxiliary power supply electric capacity, described control circuit controls conducting and the shutoff of at least one switching tube described, and auxiliary power supply voltage is provided on auxiliary power supply electric capacity, wherein when switch converters is in malfunction, described control circuit cuts out described switch converters until after restarting time of delay, described switch converters restarts, wherein said restart equal the duration that auxiliary power supply voltage is decreased to first threshold time of delay.
A switch converters according to an embodiment of the invention, this switch converters comprises at least one switching tube, with shutoff, input voltage is converted to output voltage by the conducting of this at least one switching tube; And foregoing control circuit.
According to an embodiment of the invention for a control method for switch converters, this switch converters comprises at least one switching tube, and this control method comprises: on auxiliary power supply electric capacity, provide auxiliary power supply voltage by voltage stabilizing circuit; Pulse signal is produced to control conducting and the shutoff of at least one switching tube described by on-off controller; And judge whether described switch converters is in malfunction; Wherein when described switch converters is in malfunction, voltage stabilizing circuit and on-off controller turn off completely, at least one switching tube described turns off, auxiliary power supply capacitor discharge is until when auxiliary power supply voltage is less than first threshold, voltage stabilizing circuit and on-off controller enable, described switch converters restarts.
According to the present invention propose embodiment, when switch converters breaks down by using the electric discharge duration of auxiliary power supply electric capacity as restarting the area reducing hour cost and control circuit time of delay, be easy to integrated.
Accompanying drawing explanation
By reference to accompanying drawing reading detailed description hereafter, above-mentioned and other objects of embodiment of the present invention, feature and advantage will become easy to understand.In the accompanying drawings, show some embodiments possible of the present invention by way of example, and not by way of limitation, wherein:
Fig. 1 is the circuit block diagram of switch converters 100 according to an embodiment of the invention;
Fig. 2 is according to an embodiment of the invention for the circuit block diagram of the control circuit 200 of switch converters;
Fig. 3 is the oscillogram of control circuit 200 shown in Fig. 2 according to an embodiment of the invention;
Fig. 4 is the circuit theory diagrams of buck switch converters 400 according to an embodiment of the invention;
Fig. 5 is the inside physical circuit 500 of the control chip IC1 of switch converters 400 shown in Fig. 4 according to an embodiment of the invention; And
Fig. 6 is according to an embodiment of the invention for the flow chart of the control method of switch converters.
In the accompanying drawings, identical label is used to represent same or analogous element.
Embodiment
To specific embodiments of the invention be described in detail below, it should be noted that the embodiments described herein is only for illustrating, is not limited to the present invention.In the following description, in order to provide thorough understanding of the present invention, a large amount of specific detail has been set forth.But, those of ordinary skill in the art be it is evident that: these specific detail need not be adopted to carry out the present invention.In other instances in order to avoid obscuring the present invention, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: the special characteristic, structure or the characteristic that describe in conjunction with this embodiment or example are at least one embodiment of the invention involved.Therefore, the phrase " in one embodiment " occurred in each place of whole specification, " in an embodiment ", " example " or " example " differ to establish a capital and refer to same embodiment or example.In addition, can with any combination suitably and or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that the diagram provided at this is all for illustrative purposes, and diagram is not necessarily drawn in proportion.Should be appreciated that when claim " element " " be connected to " or " coupling " to another element time, it can be directly connected or coupled to another element or also can there is intermediary element, is namely indirectly connected or coupled to another element.On the contrary, when claim element " be directly connected to " or " being directly coupled to " another element time, there is not intermediary element.Identical Reference numeral indicates identical element.Term "and/or" used herein comprises any and all combinations of one or more relevant project listed.
Fig. 1 is the circuit block diagram of switch converters 100 according to an embodiment of the invention.Switch converters 100 comprises switching circuit 11, control circuit 10 and auxiliary power supply electric capacity CVCC.
In certain embodiments, switching circuit 11 comprises at least one switching tube, control circuit 10 control switch pipe, with shutoff, input voltage is converted to output voltage by the conducting of this at least one switching tube.One end ground connection of auxiliary power supply electric capacity CVCC, the other end is couple to control circuit 10.Control circuit 10, one end is coupled to this switching tube, and the other end is coupled to the other end of auxiliary power supply electric capacity CVCC.Control circuit 10 controls conducting and the shutoff of this switching tube, and on auxiliary power supply electric capacity CVCC, provide auxiliary power supply voltage, wherein when switch converters 100 is in malfunction, control circuit 10 closing switch converter 100 is until after restarting time of delay, switch converters 100 restarts, wherein said restart equal the duration that auxiliary power supply voltage is decreased to first threshold time of delay.
In certain embodiments, control circuit 10 can comprise fault monitoring and protection circuit 12, voltage stabilizing circuit 13, restart delay circuit 14, on-off controller 15 and logical circuit 16.Switching circuit 11 has input, output, control end and feedback end, wherein input receives input voltage VIN, output provides output voltage VO, and control end is coupled to switch controlling signal CTRL, and feedback end provides the feedback signal FB of representation switch circuit state.In one embodiment, switching circuit 11 comprises at least one switching tube.Feedback signal FB such as can represent output voltage VO, input voltage VIN, output current IO etc.In one embodiment, feedback signal FB also can the temperature of reactive switches circuit 11 or control circuit 10.
Fault monitoring and protection circuit 12 comprises input and output; wherein input is coupled to the feedback end of switching circuit 11 with receiving feedback signals FB; output provides guard signal FAULT; when fault monitoring and protection circuit 12 detects that switch converters 100 is in malfunction, guard signal FAULT is effective.Voltage stabilizing circuit 13 has input, Enable Pin and output, and wherein input receives input voltage VIN, and Enable Pin receives enable signal ENABLE, and output provides auxiliary power supply voltage VCC at auxiliary power supply electric capacity CVCC two ends.Between the output that auxiliary power supply electric capacity CVCC is coupled in voltage stabilizing circuit 13 and ground, the voltage at auxiliary power supply electric capacity CVCC two ends is auxiliary power supply voltage VCC.Voltage stabilizing circuit 13 can be such as current source, linear regulator, switching regulaor or other circuit be applicable to arbitrarily.Restart delay circuit 14 and there is first input end, second input and output, wherein first input end is coupled to the output of fault monitoring and protection circuit 12 to receive guard signal FAULT, second input is coupled to the output of voltage stabilizing circuit 13 to receive auxiliary power supply voltage VCC, output provides enable signal ENABLE according to guard signal FAULT and auxiliary power supply voltage VCC, wherein when guard signal FAULT is effective, enable signal ENABLE is in the first state (invalid), voltage stabilizing circuit 13 is not enable, namely turn off completely under the control of enable signal ENABLE, auxiliary power supply electric capacity CVCC discharges, auxiliary power supply voltage VCC reduces, when auxiliary power supply voltage VCC is less than first threshold VTH1, enable signal is in the second state (effectively), voltage stabilizing circuit 13 is enable.On-off controller 15 has first input end, second input, Enable Pin and output, wherein first input end is coupled to the output of switching circuit 11, second input receives reference signal VREF, Enable Pin receives enable signal ENABLE, when enable signal ENABLE is in the first state, on-off controller 15 is not enable, namely turn off completely under the control of enable signal ENABLE, the output of on-off controller 15 exports invalid pulse signal PWM with at least one switching tube in shutdown switch circuit 11, when enable signal ENABLE is in the second state, the output of on-off controller 15 produces pulse signal PWM with the conducting of at least one switching tube in control switch circuit 11 and shutoff according to output voltage VO and reference signal VREF.Logical circuit 16 has first input end, the second input and output; wherein first input end is coupled to the output of fault monitoring and protection circuit 12; second input is coupled to the output of on-off controller 15, and output produces switch controlling signal CTRL with the conducting of at least one switching tube in control switch circuit 11 and shutoff.In one embodiment, switch converters 100 also comprises feedback circuit 17, and the output of switching circuit 11 is coupled to the first input end of on-off controller 15 by feedback circuit 17.Feedback circuit 17 has input and output, and wherein input is coupled to the output of switching circuit 11 to receive output voltage VO, and output exports the voltage feedback signal VFB representing output voltage VO.
In one embodiment, when switch converters 100 is in malfunction, guard signal FAULT is effective, enable signal ENABLE is in the first state, on-off controller 15 and voltage stabilizing circuit 13 not enable, in switching circuit 11, at least one switching tube turns off under the control of switch controlling signal CTRL, and auxiliary power supply electric capacity CVCC discharges; When auxiliary power supply voltage VCC is less than first threshold VTH1, enable signal ENABLE is in the second state, on-off controller 15 and voltage stabilizing circuit 13 enable, switch converters 100 restarts.In one embodiment; when enable signal ENABLE is in the first state; control circuits all except restarting delay circuit 14; such as fault monitoring and protection circuit 12, voltage stabilizing circuit 13, on-off controller 15, logical circuit 16 are not enable; namely turn off completely; thus the electric current that control circuits all except restarting delay circuit consumes on auxiliary power supply voltage VCC is zero, or almost nil.
When guard signal FAULT is effective; switch converters 100 is closed and is attempted restarting after one restarts time of delay; restarting delay circuit 14 utilizes the generation discharge time of auxiliary power supply electric capacity CVCC to restart time of delay; thus can avoid using complicated timing or counting circuit; reduce cost and circuit area, control circuit 10 is easier to integrated.
Fig. 2 is according to an embodiment of the invention for the circuit block diagram of the control circuit 200 of switch converters.Control circuit 200 comprises fault monitoring and protection circuit 22, voltage stabilizing circuit 23, restarts delay circuit 24 and other control circuit 25.
Fault monitoring and protection circuit 22 judges whether switch converters is in malfunction, and output protection signal FAULT.When switch converters is in malfunction, guard signal FAULT is effective, such as, be high level.In one embodiment, the malfunction of switch converters comprises excess temperature, output short-circuit, output open circuit, output overloading etc.Voltage stabilizing circuit 23 comprises current source, and have input, output and control end, wherein input is coupled to input voltage VIN, and control end receives enable signal ENABLE, and output provides auxiliary power supply voltage VCC on auxiliary power supply electric capacity CVCC.In one embodiment, when enable signal ENABLE is in the first state, current source turns off, and auxiliary power supply electric capacity CVCC discharges, the current source conduction when enable signal ENABLE is in the second state, and charges to auxiliary power supply electric capacity CVCC.Restart delay circuit 24 according to guard signal FUALT and auxiliary power supply voltage VCC output enable signal ENABLE.In one embodiment, restart delay circuit 24 and comprise undervoltage detection circuit 241 and trigger 242.Undervoltage detection circuit 241 has first input end, the second input and output, and wherein first input end receives auxiliary power supply voltage VCC, and the second input receives first threshold VTH1.In one embodiment, undervoltage detection circuit 241 comprises comparator.Trigger 242 has set input S, the RESET input R and output/Q; wherein set input S is coupled to the output of fault monitoring and protection circuit 22; the RESET input R is coupled to the output of undervoltage detection circuit 241, output/Q output enable signal ENABLE.In one embodiment; when guard signal FAULT is effective; trigger 242 set; it is (invalid that enable signal ENABLE is in the first state; as low level), until when auxiliary power supply voltage VCC is less than first threshold VTH1, trigger 242 resets; enable signal ENABLE is in the second state (effectively, as high level).Other control circuit 25 has Enable Pin, and wherein said Enable Pin receives enable signal ENABLE.Other control circuit 25 such as can comprise on-off controller, band-gap reference circuit, logical circuit etc.
In one embodiment, when switch converters is in malfunction, guard signal FAULT is effective, and enable signal ENABLE becomes the first state, voltage stabilizing circuit 23 and other control circuit 25 not enable, namely turn off completely, auxiliary power supply electric capacity CVCC discharges; When auxiliary power supply voltage VCC is decreased to first threshold VTH1, enable signal ENABLE becomes the second state, voltage stabilizing circuit 23 and other control circuit 25 enable, switch converters restarts.In one embodiment, control circuit 200 is integrated on a control chip (IC).In one embodiment, control circuit 200 is integrated on a control chip with the switching circuit comprising at least one switching tube.In one embodiment; when switch converters is in malfunction; fault monitoring and protection circuit 22, voltage stabilizing circuit 23 and to comprise other control circuit 25 of on-off controller, band-gap reference circuit, logical circuit etc. not enable; namely turn off completely; thus the power consumption of control chip when switch converters is in malfunction reduces greatly, such as almost nil.In one embodiment, when switch converters is in malfunction, control chip is not enable, restarts time of delay through one, and control chip is enable, and switch converters restarts.In the embodiment shown in Figure 2, on the basis not increasing timing or skill number circuit, utilize auxiliary power supply electric capacity CVCC electric discharge generation to restart time of delay, reduce cost and volume, control circuit 200 is easier to integrated.
Fig. 3 is the oscillogram of control circuit 200 shown in Fig. 2 according to an embodiment of the invention.Oscillogram shown in Fig. 3 is guard signal FAULT, auxiliary power supply voltage VCC and enable signal ENABLE from top to bottom successively.In the embodiment shown in fig. 3; when switch converters normally runs, guard signal FAULT invalid (low level), auxiliary power supply voltage VCC equals normal power supply voltage VCC1; enable signal ENABLE is in the second state (effectively, high level).In the T1 moment; switch converters breaks down; guard signal FAULT becomes effectively (high level), trigger 242 set, and it is (invalid that enable signal ENABLE becomes the first state; low level); fault monitoring and protection circuit 22, voltage stabilizing circuit 23 and other control circuit 25 are not enable, namely turn off completely, thus the electric current that auxiliary power supply voltage VCC consumes is zero or very little; auxiliary power supply electric capacity CVCC discharges naturally, and auxiliary power supply voltage VCC reduces gradually.In one embodiment; when enable signal ENABLE is the first state; fault monitoring and protection circuit 22, voltage stabilizing circuit 23 and other control circuit 25 are not enable; namely turn off completely; thus the electric current that foregoing circuit consumes on auxiliary power supply voltage VCC is zero or almost nil; auxiliary power supply electric capacity CVCC is by a controlled current source electric discharge, and auxiliary power supply voltage VCC reduces gradually.In the T2 moment, auxiliary power supply voltage VCC is decreased to first threshold VTH1, trigger 242 resets, enable signal ENABLE becomes the second state (effectively, high level), voltage stabilizing circuit 23 and other control circuit 25 enable, switch converters restarts, and auxiliary power supply voltage VCC increases gradually.
In the embodiment shown in fig. 3, switch converters be closed to from being detected fault restart restart time of delay Tdelay to equal from the T1 moment to the T2 moment the time interval.In one embodiment, restart time of delay Tdelay to be obtained by following formula:
Tdelay＝CVCC(VCC1-VTH1)/Idischarge；
Wherein Idischarge equals the discharging current of auxiliary power supply electric capacity CVCC.In one embodiment, by regulating the discharging current Idischarge of the capacitance of auxiliary power supply electric capacity CVCC or change auxiliary power supply electric capacity CVCC can control to restart Tdelay time of delay.
Fig. 4 is the circuit theory diagrams of buck switch converters 400 according to an embodiment of the invention.The present invention will be described for buck switch transformed circuit for Fig. 4, but those skilled in the art is known, the present invention also can be used for any applicable topology, as BUCK (step-down) circuit, BOOST (boosting) circuit, BUCK-BOOST (liter-step-down) circuit, FLYBACK (flyback) circuit and FORWARD (normal shock) circuit etc.
The output filter circuit that buck switch converters 400 comprises rectifier diode D1, the input filter circuit be made up of inductance L 1, electric capacity C1 and electric capacity C2, control chip IC1, diode D2 and is made up of inductance L 2 and electric capacity CO.Buck switch converters 400 receives AC-input voltage VAC, and by rectifier diode D1 and input filter circuit, AC-input voltage VAC is converted to DC input voitage VIN.Rectifier diode D1 has anode and negative electrode, and its Anodic is coupled to one end of AC-input voltage VAC.The first end of inductance L 1 is coupled to the negative electrode of rectifier diode D1, and one end of electric capacity C1 is coupled to the first end of inductance L 1, and the other end of electric capacity C1 is coupled to ground, and one end of electric capacity C2 is coupled to the second end of inductance L 1, and the other end of electric capacity C2 is coupled to ground.Control chip IC1 receives DC input voitage VIN, exports VD VO through output filter circuit.Control chip IC1 has the first pin D, the second pin VCCP, three-prong S and the 4th pin FB, wherein the first pin receives DC input voitage VIN, the second pin VCCP after rectification and is coupled to three-prong S by the external auxiliary electric capacity CVCC that powers, three-prong S exports VD VO, the 4th pin FB receiver voltage feedback signal VFB by output filter circuit.The concrete internal structure of control chip IC1 is by shown in Figure 5.Diode D2 has anode and negative electrode, and its Anodic is coupled to ground, and negative electrode is coupled to the three-prong S of control chip IC1.The first end of inductance L 2 is coupled to the negative electrode of diode D2, and one end of output capacitance CO is coupled to the second end of inductance L 2, and the other end of output capacitance CO is coupled to ground.Buck switch converters 400 also comprises the feedback circuit be made up of resistance R1, resistance R2, diode D3 and electric capacity C3.Wherein the anode of diode D3 is coupled to the common port of inductance L 2 and output capacitance CO, one end of electric capacity C3 is coupled to the negative electrode of diode D3, the other end of electric capacity C3 is coupled to the three-prong S of control chip IC1, one end of resistance R1 is coupled to the negative electrode of diode D3, the other end of resistance R1 is coupled to the 4th pin FB of control chip IC1, one end of resistance R2 is coupled to the 4th pin FB of control chip IC1, and the other end of resistance R2 is coupled to the three-prong S of control chip IC1.
Fig. 5 is the inside physical circuit 500 of the control chip IC1 of switch converters 400 shown in Fig. 4 according to an embodiment of the invention.As shown in Figure 5, circuit 500 comprises switching tube M1, current sampling circuit 51, fault monitoring and protection circuit 52, linear regulator (VCCLDO) 53, restarts delay circuit 54, on-off controller 55, Undervoltage lockout circuit 56, logical circuit 57 and band-gap reference circuit 58.
Switching tube M1 has first end, the second end and control end, and wherein first end is coupled to the first pin D of control chip IC1, and the second end is coupled to the three-prong S of control chip IC1.Switching tube M1 can be semiconductor switch device controlled arbitrarily, such as metal oxide semiconductor field effect tube (MOSFET), igbt (IGBT) etc.In one embodiment, second end of switching tube M1 is coupled to the three-prong S of control chip IC1 by current sampling circuit 51.Current sampling circuit 51 provides current sampling signal IS according to the electric current flowing through switching tube M1.In one embodiment, the three-prong of control signal IC1 is coupled to chip ground.
Fault monitoring and protection circuit 52 comprises thermal-shutdown circuit 521, open loop protection circuit 522, overload protecting circuit 523, short-circuit protection circuit 524 and logical circuit 525.When the temperature of control chip IC1 exceedes temperature protection threshold value, such as 150 DEG C, thermal-shutdown circuit 521 exports effective overheat protector signal OTP (as OTP=" 1 ").The input of open loop protection circuit 522 is coupled to the 4th pin FB receiver voltage feedback signal VFB of control chip IC1, and according to voltage feedback signal VFB output open circuit guard signal OpenLoop.In one embodiment, when voltage feedback signal VFB is less than open-circuit-protection threshold value, such as 150mV, open loop protection circuit 522 exports effective open-circuit-protection signal OpenLoop (as OpenLoop=" 1 ").The input of overload protecting circuit 523 is coupled to the 4th pin FB of control chip IC1, and according to voltage feedback signal VFB output overloading guard signal OLP.In one embodiment, when voltage feedback signal VFB is less than overload protection threshold value within certain continuous time, such as 2V, overload protecting circuit 523 exports effective overload protection signal OLP (as OLP=" 1 ").The input of short-circuit protection circuit 524 is coupled to the output of current sampling circuit 51, and according to current sampling signal IS output short circuit protection signal SCP.In one embodiment, when current sampling signal IS is greater than short-circuit protection threshold value, as 0.6V, short-circuit protection circuit 524 exports effective short-circuit protection signal SCP (as SCP=" 1 ").Logical circuit 525 has first input end, the second input, the 3rd input, four-input terminal and output; wherein first input end is coupled to the output of thermal-shutdown circuit 521; second input is coupled to the output of open loop protection circuit 522; 3rd input is coupled to the output of overload protecting circuit 523; four-input terminal is coupled to the output of short-circuit protection circuit 524, and output is according to overheat protector signal OTP, open-circuit-protection signal OpenLoop, overload protection signal OLP and short-circuit protection signal SCP output protection signal FAULT.In one embodiment, when one or several in excess temperature guard signal OTP, open-circuit-protection signal OpenLoop, overload protection signal OLP or short-circuit protection signal SCP is effective, guard signal FAULT is effective.In one embodiment, fault monitoring and protection circuit 52 also comprises guard delay circuit, and produce the guard delay time, when detecting that switch converters breaks down, after the guard delay time, guard signal FAULT is effective.Logical circuit 525 such as can comprise NOR gate.
Linear regulator 53 has input, Enable Pin, control end and output, wherein input is coupled to the first pin D of control chip IC1 to receive DC input voitage VIN, Enable Pin receives enable signal ENABLE, control end receives Undervoltage lockout signal UV1, and output produces auxiliary power supply voltage VCC by the second pin VCCP of control chip IC1 on auxiliary power supply electric capacity CVCC.In one embodiment, when enable signal ENABLE is in the first state (invalid, as low level) or Undervoltage lockout signal UV1 is effective, linear regulator 53 turns off, and auxiliary power supply electric capacity CVCC discharges, and auxiliary power supply voltage VCC reduces.In one embodiment, when enable signal ENABLE is in the second state (effectively, as high level) and Undervoltage lockout signal UV1 is invalid time, linear regulator 53 conducting is also charged to auxiliary power supply electric capacity CVCC, auxiliary power supply voltage VCC increase or maintain.
Restart delay circuit 54 and comprise undervoltage detection circuit 541 and trigger 542.Undervoltage detection circuit 541 comprises comparator, has in-phase input end, inverting input and output, and wherein in-phase input end receives first threshold VTH1, and inverting input receives auxiliary power supply voltage VCC.Trigger 542 has set end S, reset terminal R and output/Q, and wherein set end S is coupled to the output of fault monitoring and protection circuit 52, and reset terminal R is coupled to the output of undervoltage detection circuit 541, output/Q output enable signal ENABLE.When guard signal FAULT is effective, trigger 542 set, enable signal ENABLE becomes the first state, until when auxiliary power supply voltage VCC is less than first threshold VTH1, trigger 542 resets, enable signal ENABLE becomes the second state.In one embodiment, restart delay circuit 54 and also comprise the discharge circuit be made up of current source 543 and switching tube 544.Current source 543 has first end and the second end, and wherein first end receives auxiliary power supply voltage VCC.Switching tube 544 has first end, the second end and control end, and wherein first end is coupled to the second end of current source 543, and the second end is coupled to chip ground, and control end is coupled to the output of trigger 542.When enable signal ENABLE is in the first state, switching tube 544 conducting, auxiliary power supply electric capacity CVCC is discharged by current source 543, and when enable signal ENABLE is in the second state, switching tube 544 turns off.In one embodiment, by the size of adjustment current source 543 output current, the discharging current of auxiliary power supply electric capacity CVCC can be controlled, thus Tdelay time of delay is restarted in adjustment.
On-off controller 55 comprises peak current control circuitry 551, output voltage controlling circuit 552 and logical circuit 553.Peak current control circuitry 551 has first input end, the second input, Enable Pin and output, wherein first input end is coupled to the output of current sampling circuit 51 with received current sampled signal IS, second input receives peak current reference signal ILimit, and Enable Pin receives enable signal ENABLE.When enable signal ENABLE is in the second state, peak current control circuitry 551 is enable, otherwise when enable signal ENABLE is in the first state, peak current control circuitry 551 is not enable, namely turns off completely.In one embodiment, peak current control circuitry 551 comprises comparator COM1.Output voltage controlling circuit 552 has first input end, the second input, Enable Pin and output, wherein first input end is coupled to the 4th pin FB of control chip IC1 with receiver voltage feedback signal VFB, second input receives reference signal VREF, and Enable Pin receives enable signal ENABLE.In one embodiment, output voltage controlling circuit 552 comprises error amplifier EA.Logical circuit 553 has set input S, the RESET input R, Enable Pin and output, wherein set input S is coupled to the output of output voltage controlling circuit 552, the RESET input R is coupled to the output of peak current control circuitry 551, Enable Pin receives enable signal ENABLE, output output pulse signal PWM.In one embodiment, logical circuit 553 comprises rest-set flip-flop.
Undervoltage lockout circuit 56 exports Undervoltage lockout signal UV1 and Undervoltage lockout signal UV2 according to auxiliary power supply voltage VCC.In one embodiment, Undervoltage lockout circuit 56 comprises hysteresis loop comparator 561 and hysteresis loop comparator 562.Hysteresis loop comparator 561 has in-phase input end, inverting input and output, wherein in-phase input end is coupled to auxiliary power supply voltage VCC, inverting input is coupled to the first auxiliary power supply reference signal VCCH and the second auxiliary power supply reference signal VCCL, and output exports the control end of Undervoltage lockout signal UV1 to linear regulator 53.In one embodiment, when auxiliary power supply voltage VCC increases to the first auxiliary power supply reference signal VCCH, Undervoltage lockout signal UV1 becomes effectively, linear regulator 53 turns off, when auxiliary power supply voltage VCC is decreased to the second auxiliary power supply reference signal VCCL, it is invalid that Undervoltage lockout signal UV1 becomes, and linear regulator 53 is open-minded.Hysteresis loop comparator 562 has in-phase input end, inverting input and output, wherein in-phase input end is coupled to auxiliary power supply voltage VCC, inverting input is coupled to the first auxiliary power supply reference signal VCCH and Second Threshold VTH2, and output exports Undervoltage lockout signal UV2.In one embodiment, when auxiliary power supply voltage VCC increases to the first auxiliary power supply reference signal VCCH, it is invalid that Undervoltage lockout signal UV2 becomes, and when auxiliary power supply voltage VCC is decreased to Second Threshold VTH2, Undervoltage lockout signal UV2 becomes effectively.In one embodiment, the first auxiliary power supply reference signal VCCH is greater than the second auxiliary power supply reference signal VCCL, and the second auxiliary power supply reference signal VCCL is greater than Second Threshold VTH2, and Second Threshold VTH2 is greater than first threshold VTH1.Such as the first auxiliary power supply reference signal VCCH is 4.7V, and the second auxiliary power supply reference signal is 4.5V, and Second Threshold VTH2 is 3.0V, first threshold VTH1 is 2V.With shutoff, Undervoltage lockout signal UV1 can ensure that auxiliary power supply voltage VCC is in normal working voltage scope by the conducting of control linear adjuster 53 while, there is less power consumption.
Logical circuit 57 has first input end, the second input, the 3rd input and output; wherein first input end is coupled to the output of on-off controller 55 with return pulse signal PWM; second input is coupled to the output of fault monitoring and protection circuit 52 to receive guard signal FAULT; 3rd input is coupled to the output of Undervoltage lockout circuit 56 to receive Undervoltage lockout signal UV2, output output switch control signal CTRL.In one embodiment; when Undervoltage lockout signal UV2 or guard signal FAULT is effective; switch controlling signal CTRL control switch pipe M1 turns off; when Undervoltage lockout signal UV2 and guard signal FAULT is all invalid, switch controlling signal CTRL is according to the conducting of pulse signal PWM control switch pipe M1 and shutoff.In one embodiment, logical circuit 57 comprises and door.In one embodiment, the VTH2 when auxiliary power supply voltage VCC is decreased to Second Threshold, Undervoltage lockout signal UV2 by logical circuit 57 on-off switching tube M1, thus can avoid the misoperation of the control chip IC1 switch tube M1 caused because auxiliary power supply voltage VCC is too small.
Band-gap reference circuit 58 receives auxiliary power supply voltage VCC, and exports bandgap reference signal BANGAP according to auxiliary power supply voltage VCC.In one embodiment, when enable signal ENABLE is in the first state, band-gap reference circuit 58 is not enable, namely turns off completely.In one embodiment, band-gap reference circuit 58 comprises linear regulator.
In one embodiment; when enable signal ENABLE is in the first state; control chip IC1 turns off; control circuits all except restarting delay circuit 54 in circuit 500 turns off completely; namely current sampling circuit 51, fault monitoring and protection circuit 52, linear regulator (VCCLDO) 53, on-off controller 55, Undervoltage lockout circuit 56, logical circuit 57 and band-gap reference circuit 58 turn off completely, thus the electric current that the control circuit except restarting delay circuit 54 consumes on auxiliary power supply voltage VCC is zero or almost nil.
Fig. 6 is according to an embodiment of the invention for the flow chart of the control method of switch converters.
This switch converters comprises the switching circuit with at least one switching tube.This control method comprises step S601 ~ S605.
In step S601, produce auxiliary power supply voltage by voltage stabilizing circuit.
In step S602, produce pulse signal to control conducting and the shutoff of at least one switching tube described by on-off controller.In one embodiment, described on-off controller produces pulse signal based on the output voltage of switch converters and reference signal.
In step S603, judge whether described switch converters is in malfunction.In one embodiment, described malfunction comprises excess temperature, overload, output short-circuit, output open circuit etc.When described switch converters is in malfunction, enter step S604.
In step S604, described voltage stabilizing circuit and described on-off controller turn off completely, and at least one switching tube described turns off, auxiliary power supply capacitor discharge, and auxiliary power supply voltage reduces.
In step S605, when described auxiliary power supply voltage is decreased to first threshold, described voltage stabilizing circuit and described on-off controller enable, switch converters restarts.
Note, in above-described flow chart, the function marked in frame also can according to being different from occurring in sequence shown in figure.Such as, in fact the square frame that two adjoining lands represent can perform substantially concurrently, and they also can perform by contrary order sometimes, and this depends on involved concrete function.
Only the present invention will be described in an exemplary fashion for some above-mentioned specific embodiments, and these embodiments are not completely detailed, the scope be not intended to limit the present invention.It is all possible for carrying out changing and revising for disclosed embodiment, other feasible selectivity embodiments and to the equivalent variations of element in embodiment can understand by those skilled in the art.Other changes of disclosed embodiment of this invention and amendment do not exceed spirit of the present invention and protection range.
Claims (10)
1. a control circuit, at least one switching tube in control switch converter, described control circuit comprises:
Voltage stabilizing circuit, has Enable Pin and output, and wherein Enable Pin receives enable signal, and output provides auxiliary power supply voltage on auxiliary power supply electric capacity;
On-off controller, there is first input end, the second input, Enable Pin and output, wherein first input end is coupled to the output of switch converters to receive output voltage, second input is coupled to reference signal, Enable Pin receives enable signal, and output produces pulse signal according to output voltage and reference signal; And
First logical circuit, there is first input end, the second input and output, the output that wherein first input end couples guard signal, the second input is coupled to on-off controller, output produces switch controlling signal to control conducting and the shutoff of at least one switching tube described according to guard signal and pulse signal, wherein, when detecting that switch converters is in malfunction, guard signal is effective; Wherein
When guard signal is effective; enable signal becomes the first state, and voltage stabilizing circuit and on-off controller turn off completely, and auxiliary power supply capacitor discharge is until when auxiliary power supply voltage is less than first threshold; enable signal becomes the second state, voltage stabilizing circuit and on-off controller enable.
2. control circuit as claimed in claim 1, wherein said on-off controller comprises:
Peak current control circuitry, electric current and peak current reference signal according to flowing through at least one switching tube described provide peak value comparison method signal;
Output voltage controlling circuit, produces output voltage control signal according to output voltage and reference signal; And
Second logical circuit, provides pulse signal according to peak value comparison method signal and output voltage control signal.
3. control circuit as claimed in claim 1 also comprises Undervoltage lockout circuit, and described Undervoltage lockout circuit turns off according to the comparative result of auxiliary power supply voltage and the first auxiliary power supply reference signal and the second auxiliary power supply reference signal or opens voltage stabilizing circuit.
4. control circuit as claimed in claim 1 also comprises Undervoltage lockout circuit, described Undervoltage lockout circuit exports Undervoltage lockout signal according to the comparative result of auxiliary power supply voltage and the first auxiliary power supply reference signal and Second Threshold, wherein said first logical circuit also comprises the 3rd input, and wherein the 3rd input receives Undervoltage lockout signal.
5. the control circuit as described in claim 3 or 4, wherein when enable signal is the first state, fault monitoring and protection circuit and Undervoltage lockout circuit turn off completely.
6. control circuit as claimed in claim 2, comprises and restarts delay circuit, produces enable signal, wherein when switch converters breaks down, enable signal becomes the first state, and auxiliary power supply capacitor discharge is until when auxiliary power supply voltage is less than first threshold, and enable signal becomes the second state.
7. control circuit as claimed in claim 6, wherein saidly restart delay circuit and comprise:
Undervoltage detection circuit, has first input end, the second input and output, and wherein first input end receives auxiliary power supply voltage, and the second input receives first threshold; And
Trigger, has set end, reset terminal and output, and wherein set termination receives guard signal, and reset terminal is coupled to the output of undervoltage detection circuit, output output enable signal.
8. control circuit as claimed in claim 6, wherein saidly restart delay circuit and comprise:
Current source, has first end and the second end, and wherein first end receives auxiliary power supply voltage; And
Second switch pipe, has first end, the second end and control end, and wherein first end is coupled to the second end of current source, and the second end is coupled to ground, and control end receives enable signal; Wherein
When enable signal is in the first state, the conducting of second switch pipe, auxiliary power supply electric capacity is discharged by current source.
9. a switch converters, comprising:
At least one switching tube, is converted to output voltage with shutoff by input voltage by the conducting of this at least one switching tube; And
Control circuit according to any one of claim 1 to 8.
10. for a control method for switch converters, this switch converters comprises at least one switching tube, and this control method comprises:
On auxiliary power supply electric capacity, auxiliary power supply voltage is provided by voltage stabilizing circuit;
Pulse signal is produced to control conducting and the shutoff of at least one switching tube described by on-off controller; And
Judge whether described switch converters is in malfunction; Wherein
When described switch converters is in malfunction, voltage stabilizing circuit and on-off controller turn off completely, at least one switching tube described turns off, auxiliary power supply capacitor discharge is until when auxiliary power supply voltage is less than first threshold, voltage stabilizing circuit and on-off controller enable, described switch converters restarts.
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| CN201310379257.8A CN103414322B (en) | 2013-08-27 | 2013-08-27 | Control circuit, switch converter and control method thereof |
| US14/470,229 US9608509B2 (en) | 2013-08-27 | 2014-08-27 | Switching converter with controllable restart delay and associated control method |
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| CN201310379257.8A CN103414322B (en) | 2013-08-27 | 2013-08-27 | Control circuit, switch converter and control method thereof |
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| RU2542346C1 (en) * | 2013-11-15 | 2015-02-20 | Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" | Maximum power protection device for inverter |
| US9772897B1 (en) * | 2014-12-19 | 2017-09-26 | Xilinx, Inc. | Methods and systems for improving safety of processor system |
| CN105490532B (en) * | 2016-01-06 | 2019-04-12 | 深圳欧创芯半导体有限公司 | DC-DC converter and system |
| CN105826901B (en) * | 2016-04-26 | 2018-09-18 | 武汉理工大学 | digital switch converter protection circuit |
| CN105846654B (en) * | 2016-05-07 | 2019-03-05 | 中国电子科技集团公司第四十三研究所 | A kind of half-bridge synchronous rectification integrated controller electronics |
| CN109802565B (en) * | 2017-11-16 | 2020-06-05 | 立锜科技股份有限公司 | Switching power supply and control circuit thereof |
| IT201900017312A1 (en) * | 2019-09-27 | 2021-03-27 | St Microelectronics Srl | BROWN-OUT PROTECTION CIRCUIT FOR A SWITCHING CONVERTER AND METHOD TO CONTROL A SWITCHING CONVERTER |
| CN111175604B (en) * | 2020-01-09 | 2021-02-26 | 中南大学 | LLC resonant converter fault diagnosis method based on resonant capacitor voltage |
| TWI737292B (en) * | 2020-05-08 | 2021-08-21 | 通嘉科技股份有限公司 | Voltage mode controller applied to short-circuited protection of a power converter and operational method thereof |
| CN111711170B (en) * | 2020-07-07 | 2023-06-13 | 成都芯源系统有限公司 | Switching power supply short-circuit protection circuit and method |
| CN112803763B (en) * | 2021-02-03 | 2022-07-05 | 深圳市必易微电子股份有限公司 | Control circuit, voltage conversion system and control method thereof |
| US11791705B1 (en) * | 2022-06-14 | 2023-10-17 | Monolithic Power Systems, Inc. | Multi-phase voltage converter with identification codes assignment |
| CN116388570B (en) * | 2023-06-07 | 2023-08-04 | 盈力半导体(上海)有限公司 | Buck circuit chip |
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| US20150061630A1 (en) | 2015-03-05 |
| US9608509B2 (en) | 2017-03-28 |
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